git.oblomov.eu Git - git/blob - upload-pack.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "refs.h"
   4 #include "pkt-line.h"
   5 #include "sideband.h"
   6 #include "repository.h"
   7 #include "object-store.h"
   8 #include "tag.h"
   9 #include "object.h"
  10 #include "commit.h"
  11 #include "diff.h"
  12 #include "revision.h"
  13 #include "list-objects.h"
  14 #include "list-objects-filter.h"
  15 #include "list-objects-filter-options.h"
  16 #include "run-command.h"
  17 #include "connect.h"
  18 #include "sigchain.h"
  19 #include "version.h"
  20 #include "string-list.h"
  21 #include "argv-array.h"
  22 #include "prio-queue.h"
  23 #include "protocol.h"
  24 #include "quote.h"
  25 #include "upload-pack.h"
  26 #include "serve.h"
  27 #include "commit-graph.h"
  28 #include "commit-reach.h"
  29 #include "shallow.h"
  30
  31 /* Remember to update object flag allocation in object.h */
  32 #define THEY_HAVE       (1u << 11)
  33 #define OUR_REF         (1u << 12)
  34 #define WANTED          (1u << 13)
  35 #define COMMON_KNOWN    (1u << 14)
  36
  37 #define SHALLOW         (1u << 16)
  38 #define NOT_SHALLOW     (1u << 17)
  39 #define CLIENT_SHALLOW  (1u << 18)
  40 #define HIDDEN_REF      (1u << 19)
  41
  42 #define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
  43                 NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
  44
  45 static timestamp_t oldest_have;
  46
  47 /* Allow specifying sha1 if it is a ref tip. */
  48 #define ALLOW_TIP_SHA1  01
  49 /* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
  50 #define ALLOW_REACHABLE_SHA1    02
  51 /* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
  52 #define ALLOW_ANY_SHA1  07
  53 static unsigned int allow_unadvertised_object_request;
  54 static int shallow_nr;
  55 static struct object_array extra_edge_obj;
  56 static int keepalive = 5;
  57 static const char *pack_objects_hook;
  58
  59 static int allow_filter;
  60 static int allow_ref_in_want;
  61
  62 static int allow_sideband_all;
  63
  64 /*
  65  * Please annotate, and if possible group together, fields used only
  66  * for protocol v0 or only for protocol v2.
  67  */
  68 struct upload_pack_data {
  69         struct string_list symref;                              /* v0 only */
  70         struct object_array want_obj;
  71         struct object_array have_obj;
  72         struct oid_array haves;                                 /* v2 only */
  73         struct string_list wanted_refs;                         /* v2 only */
  74
  75         struct object_array shallows;
  76         struct string_list deepen_not;
  77         int depth;
  78         timestamp_t deepen_since;
  79         int deepen_rev_list;
  80         int deepen_relative;
  81
  82         unsigned int timeout;                                   /* v0 only */
  83         int multi_ack;                                          /* v0 only */
  84
  85         /* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
  86         int use_sideband;
  87
  88         struct list_objects_filter_options filter_options;
  89
  90         struct packet_writer writer;
  91
  92         unsigned stateless_rpc : 1;                             /* v0 only */
  93         unsigned no_done : 1;                                   /* v0 only */
  94         unsigned daemon_mode : 1;                               /* v0 only */
  95         unsigned filter_capability_requested : 1;               /* v0 only */
  96
  97         unsigned use_thin_pack : 1;
  98         unsigned use_ofs_delta : 1;
  99         unsigned no_progress : 1;
 100         unsigned use_include_tag : 1;
 101
 102         unsigned done : 1;                                      /* v2 only */
 103 };
 104
 105 static void upload_pack_data_init(struct upload_pack_data *data)
 106 {
 107         struct string_list symref = STRING_LIST_INIT_DUP;
 108         struct string_list wanted_refs = STRING_LIST_INIT_DUP;
 109         struct object_array want_obj = OBJECT_ARRAY_INIT;
 110         struct object_array have_obj = OBJECT_ARRAY_INIT;
 111         struct oid_array haves = OID_ARRAY_INIT;
 112         struct object_array shallows = OBJECT_ARRAY_INIT;
 113         struct string_list deepen_not = STRING_LIST_INIT_DUP;
 114
 115         memset(data, 0, sizeof(*data));
 116         data->symref = symref;
 117         data->wanted_refs = wanted_refs;
 118         data->want_obj = want_obj;
 119         data->have_obj = have_obj;
 120         data->haves = haves;
 121         data->shallows = shallows;
 122         data->deepen_not = deepen_not;
 123         packet_writer_init(&data->writer, 1);
 124 }
 125
 126 static void upload_pack_data_clear(struct upload_pack_data *data)
 127 {
 128         string_list_clear(&data->symref, 1);
 129         string_list_clear(&data->wanted_refs, 1);
 130         object_array_clear(&data->want_obj);
 131         object_array_clear(&data->have_obj);
 132         oid_array_clear(&data->haves);
 133         object_array_clear(&data->shallows);
 134         string_list_clear(&data->deepen_not, 0);
 135         list_objects_filter_release(&data->filter_options);
 136 }
 137
 138 static void reset_timeout(unsigned int timeout)
 139 {
 140         alarm(timeout);
 141 }
 142
 143 static void send_client_data(int fd, const char *data, ssize_t sz,
 144                              int use_sideband)
 145 {
 146         if (use_sideband) {
 147                 send_sideband(1, fd, data, sz, use_sideband);
 148                 return;
 149         }
 150         if (fd == 3)
 151                 /* emergency quit */
 152                 fd = 2;
 153         if (fd == 2) {
 154                 /* XXX: are we happy to lose stuff here? */
 155                 xwrite(fd, data, sz);
 156                 return;
 157         }
 158         write_or_die(fd, data, sz);
 159 }
 160
 161 static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 162 {
 163         FILE *fp = cb_data;
 164         if (graft->nr_parent == -1)
 165                 fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 166         return 0;
 167 }
 168
 169 static void create_pack_file(struct upload_pack_data *pack_data)
 170 {
 171         struct child_process pack_objects = CHILD_PROCESS_INIT;
 172         char data[8193], progress[128];
 173         char abort_msg[] = "aborting due to possible repository "
 174                 "corruption on the remote side.";
 175         int buffered = -1;
 176         ssize_t sz;
 177         int i;
 178         FILE *pipe_fd;
 179
 180         if (!pack_objects_hook)
 181                 pack_objects.git_cmd = 1;
 182         else {
 183                 argv_array_push(&pack_objects.args, pack_objects_hook);
 184                 argv_array_push(&pack_objects.args, "git");
 185                 pack_objects.use_shell = 1;
 186         }
 187
 188         if (shallow_nr) {
 189                 argv_array_push(&pack_objects.args, "--shallow-file");
 190                 argv_array_push(&pack_objects.args, "");
 191         }
 192         argv_array_push(&pack_objects.args, "pack-objects");
 193         argv_array_push(&pack_objects.args, "--revs");
 194         if (pack_data->use_thin_pack)
 195                 argv_array_push(&pack_objects.args, "--thin");
 196
 197         argv_array_push(&pack_objects.args, "--stdout");
 198         if (shallow_nr)
 199                 argv_array_push(&pack_objects.args, "--shallow");
 200         if (!pack_data->no_progress)
 201                 argv_array_push(&pack_objects.args, "--progress");
 202         if (pack_data->use_ofs_delta)
 203                 argv_array_push(&pack_objects.args, "--delta-base-offset");
 204         if (pack_data->use_include_tag)
 205                 argv_array_push(&pack_objects.args, "--include-tag");
 206         if (pack_data->filter_options.choice) {
 207                 const char *spec =
 208                         expand_list_objects_filter_spec(&pack_data->filter_options);
 209                 if (pack_objects.use_shell) {
 210                         struct strbuf buf = STRBUF_INIT;
 211                         sq_quote_buf(&buf, spec);
 212                         argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
 213                         strbuf_release(&buf);
 214                 } else {
 215                         argv_array_pushf(&pack_objects.args, "--filter=%s",
 216                                          spec);
 217                 }
 218         }
 219
 220         pack_objects.in = -1;
 221         pack_objects.out = -1;
 222         pack_objects.err = -1;
 223
 224         if (start_command(&pack_objects))
 225                 die("git upload-pack: unable to fork git-pack-objects");
 226
 227         pipe_fd = xfdopen(pack_objects.in, "w");
 228
 229         if (shallow_nr)
 230                 for_each_commit_graft(write_one_shallow, pipe_fd);
 231
 232         for (i = 0; i < pack_data->want_obj.nr; i++)
 233                 fprintf(pipe_fd, "%s\n",
 234                         oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
 235         fprintf(pipe_fd, "--not\n");
 236         for (i = 0; i < pack_data->have_obj.nr; i++)
 237                 fprintf(pipe_fd, "%s\n",
 238                         oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
 239         for (i = 0; i < extra_edge_obj.nr; i++)
 240                 fprintf(pipe_fd, "%s\n",
 241                         oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 242         fprintf(pipe_fd, "\n");
 243         fflush(pipe_fd);
 244         fclose(pipe_fd);
 245
 246         /* We read from pack_objects.err to capture stderr output for
 247          * progress bar, and pack_objects.out to capture the pack data.
 248          */
 249
 250         while (1) {
 251                 struct pollfd pfd[2];
 252                 int pe, pu, pollsize;
 253                 int ret;
 254
 255                 reset_timeout(pack_data->timeout);
 256
 257                 pollsize = 0;
 258                 pe = pu = -1;
 259
 260                 if (0 <= pack_objects.out) {
 261                         pfd[pollsize].fd = pack_objects.out;
 262                         pfd[pollsize].events = POLLIN;
 263                         pu = pollsize;
 264                         pollsize++;
 265                 }
 266                 if (0 <= pack_objects.err) {
 267                         pfd[pollsize].fd = pack_objects.err;
 268                         pfd[pollsize].events = POLLIN;
 269                         pe = pollsize;
 270                         pollsize++;
 271                 }
 272
 273                 if (!pollsize)
 274                         break;
 275
 276                 ret = poll(pfd, pollsize,
 277                         keepalive < 0 ? -1 : 1000 * keepalive);
 278
 279                 if (ret < 0) {
 280                         if (errno != EINTR) {
 281                                 error_errno("poll failed, resuming");
 282                                 sleep(1);
 283                         }
 284                         continue;
 285                 }
 286                 if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
 287                         /* Status ready; we ship that in the side-band
 288                          * or dump to the standard error.
 289                          */
 290                         sz = xread(pack_objects.err, progress,
 291                                   sizeof(progress));
 292                         if (0 < sz)
 293                                 send_client_data(2, progress, sz,
 294                                                  pack_data->use_sideband);
 295                         else if (sz == 0) {
 296                                 close(pack_objects.err);
 297                                 pack_objects.err = -1;
 298                         }
 299                         else
 300                                 goto fail;
 301                         /* give priority to status messages */
 302                         continue;
 303                 }
 304                 if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
 305                         /* Data ready; we keep the last byte to ourselves
 306                          * in case we detect broken rev-list, so that we
 307                          * can leave the stream corrupted.  This is
 308                          * unfortunate -- unpack-objects would happily
 309                          * accept a valid packdata with trailing garbage,
 310                          * so appending garbage after we pass all the
 311                          * pack data is not good enough to signal
 312                          * breakage to downstream.
 313                          */
 314                         char *cp = data;
 315                         ssize_t outsz = 0;
 316                         if (0 <= buffered) {
 317                                 *cp++ = buffered;
 318                                 outsz++;
 319                         }
 320                         sz = xread(pack_objects.out, cp,
 321                                   sizeof(data) - outsz);
 322                         if (0 < sz)
 323                                 ;
 324                         else if (sz == 0) {
 325                                 close(pack_objects.out);
 326                                 pack_objects.out = -1;
 327                         }
 328                         else
 329                                 goto fail;
 330                         sz += outsz;
 331                         if (1 < sz) {
 332                                 buffered = data[sz-1] & 0xFF;
 333                                 sz--;
 334                         }
 335                         else
 336                                 buffered = -1;
 337                         send_client_data(1, data, sz,
 338                                          pack_data->use_sideband);
 339                 }
 340
 341                 /*
 342                  * We hit the keepalive timeout without saying anything; send
 343                  * an empty message on the data sideband just to let the other
 344                  * side know we're still working on it, but don't have any data
 345                  * yet.
 346                  *
 347                  * If we don't have a sideband channel, there's no room in the
 348                  * protocol to say anything, so those clients are just out of
 349                  * luck.
 350                  */
 351                 if (!ret && pack_data->use_sideband) {
 352                         static const char buf[] = "0005\1";
 353                         write_or_die(1, buf, 5);
 354                 }
 355         }
 356
 357         if (finish_command(&pack_objects)) {
 358                 error("git upload-pack: git-pack-objects died with error.");
 359                 goto fail;
 360         }
 361
 362         /* flush the data */
 363         if (0 <= buffered) {
 364                 data[0] = buffered;
 365                 send_client_data(1, data, 1,
 366                                  pack_data->use_sideband);
 367                 fprintf(stderr, "flushed.\n");
 368         }
 369         if (pack_data->use_sideband)
 370                 packet_flush(1);
 371         return;
 372
 373  fail:
 374         send_client_data(3, abort_msg, sizeof(abort_msg),
 375                          pack_data->use_sideband);
 376         die("git upload-pack: %s", abort_msg);
 377 }
 378
 379 static int got_oid(const char *hex, struct object_id *oid,
 380                    struct object_array *have_obj)
 381 {
 382         struct object *o;
 383         int we_knew_they_have = 0;
 384
 385         if (get_oid_hex(hex, oid))
 386                 die("git upload-pack: expected SHA1 object, got '%s'", hex);
 387         if (!has_object_file(oid))
 388                 return -1;
 389
 390         o = parse_object(the_repository, oid);
 391         if (!o)
 392                 die("oops (%s)", oid_to_hex(oid));
 393         if (o->type == OBJ_COMMIT) {
 394                 struct commit_list *parents;
 395                 struct commit *commit = (struct commit *)o;
 396                 if (o->flags & THEY_HAVE)
 397                         we_knew_they_have = 1;
 398                 else
 399                         o->flags |= THEY_HAVE;
 400                 if (!oldest_have || (commit->date < oldest_have))
 401                         oldest_have = commit->date;
 402                 for (parents = commit->parents;
 403                      parents;
 404                      parents = parents->next)
 405                         parents->item->object.flags |= THEY_HAVE;
 406         }
 407         if (!we_knew_they_have) {
 408                 add_object_array(o, NULL, have_obj);
 409                 return 1;
 410         }
 411         return 0;
 412 }
 413
 414 static int ok_to_give_up(const struct object_array *have_obj,
 415                          struct object_array *want_obj)
 416 {
 417         uint32_t min_generation = GENERATION_NUMBER_ZERO;
 418
 419         if (!have_obj->nr)
 420                 return 0;
 421
 422         return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
 423                                             COMMON_KNOWN, oldest_have,
 424                                             min_generation);
 425 }
 426
 427 static int get_common_commits(struct upload_pack_data *data,
 428                               struct packet_reader *reader)
 429 {
 430         struct object_id oid;
 431         char last_hex[GIT_MAX_HEXSZ + 1];
 432         int got_common = 0;
 433         int got_other = 0;
 434         int sent_ready = 0;
 435
 436         save_commit_buffer = 0;
 437
 438         for (;;) {
 439                 const char *arg;
 440
 441                 reset_timeout(data->timeout);
 442
 443                 if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
 444                         if (data->multi_ack == 2
 445                             && got_common
 446                             && !got_other
 447                             && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 448                                 sent_ready = 1;
 449                                 packet_write_fmt(1, "ACK %s ready\n", last_hex);
 450                         }
 451                         if (data->have_obj.nr == 0 || data->multi_ack)
 452                                 packet_write_fmt(1, "NAK\n");
 453
 454                         if (data->no_done && sent_ready) {
 455                                 packet_write_fmt(1, "ACK %s\n", last_hex);
 456                                 return 0;
 457                         }
 458                         if (data->stateless_rpc)
 459                                 exit(0);
 460                         got_common = 0;
 461                         got_other = 0;
 462                         continue;
 463                 }
 464                 if (skip_prefix(reader->line, "have ", &arg)) {
 465                         switch (got_oid(arg, &oid, &data->have_obj)) {
 466                         case -1: /* they have what we do not */
 467                                 got_other = 1;
 468                                 if (data->multi_ack
 469                                     && ok_to_give_up(&data->have_obj, &data->want_obj)) {
 470                                         const char *hex = oid_to_hex(&oid);
 471                                         if (data->multi_ack == 2) {
 472                                                 sent_ready = 1;
 473                                                 packet_write_fmt(1, "ACK %s ready\n", hex);
 474                                         } else
 475                                                 packet_write_fmt(1, "ACK %s continue\n", hex);
 476                                 }
 477                                 break;
 478                         default:
 479                                 got_common = 1;
 480                                 oid_to_hex_r(last_hex, &oid);
 481                                 if (data->multi_ack == 2)
 482                                         packet_write_fmt(1, "ACK %s common\n", last_hex);
 483                                 else if (data->multi_ack)
 484                                         packet_write_fmt(1, "ACK %s continue\n", last_hex);
 485                                 else if (data->have_obj.nr == 1)
 486                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 487                                 break;
 488                         }
 489                         continue;
 490                 }
 491                 if (!strcmp(reader->line, "done")) {
 492                         if (data->have_obj.nr > 0) {
 493                                 if (data->multi_ack)
 494                                         packet_write_fmt(1, "ACK %s\n", last_hex);
 495                                 return 0;
 496                         }
 497                         packet_write_fmt(1, "NAK\n");
 498                         return -1;
 499                 }
 500                 die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
 501         }
 502 }
 503
 504 static int is_our_ref(struct object *o)
 505 {
 506         int allow_hidden_ref = (allow_unadvertised_object_request &
 507                         (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
 508         return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 509 }
 510
 511 /*
 512  * on successful case, it's up to the caller to close cmd->out
 513  */
 514 static int do_reachable_revlist(struct child_process *cmd,
 515                                 struct object_array *src,
 516                                 struct object_array *reachable)
 517 {
 518         static const char *argv[] = {
 519                 "rev-list", "--stdin", NULL,
 520         };
 521         struct object *o;
 522         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 523         int i;
 524         const unsigned hexsz = the_hash_algo->hexsz;
 525
 526         cmd->argv = argv;
 527         cmd->git_cmd = 1;
 528         cmd->no_stderr = 1;
 529         cmd->in = -1;
 530         cmd->out = -1;
 531
 532         /*
 533          * If the next rev-list --stdin encounters an unknown commit,
 534          * it terminates, which will cause SIGPIPE in the write loop
 535          * below.
 536          */
 537         sigchain_push(SIGPIPE, SIG_IGN);
 538
 539         if (start_command(cmd))
 540                 goto error;
 541
 542         namebuf[0] = '^';
 543         namebuf[hexsz + 1] = '\n';
 544         for (i = get_max_object_index(); 0 < i; ) {
 545                 o = get_indexed_object(--i);
 546                 if (!o)
 547                         continue;
 548                 if (reachable && o->type == OBJ_COMMIT)
 549                         o->flags &= ~TMP_MARK;
 550                 if (!is_our_ref(o))
 551                         continue;
 552                 memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
 553                 if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
 554                         goto error;
 555         }
 556         namebuf[hexsz] = '\n';
 557         for (i = 0; i < src->nr; i++) {
 558                 o = src->objects[i].item;
 559                 if (is_our_ref(o)) {
 560                         if (reachable)
 561                                 add_object_array(o, NULL, reachable);
 562                         continue;
 563                 }
 564                 if (reachable && o->type == OBJ_COMMIT)
 565                         o->flags |= TMP_MARK;
 566                 memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
 567                 if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
 568                         goto error;
 569         }
 570         close(cmd->in);
 571         cmd->in = -1;
 572         sigchain_pop(SIGPIPE);
 573
 574         return 0;
 575
 576 error:
 577         sigchain_pop(SIGPIPE);
 578
 579         if (cmd->in >= 0)
 580                 close(cmd->in);
 581         if (cmd->out >= 0)
 582                 close(cmd->out);
 583         return -1;
 584 }
 585
 586 static int get_reachable_list(struct object_array *src,
 587                               struct object_array *reachable)
 588 {
 589         struct child_process cmd = CHILD_PROCESS_INIT;
 590         int i;
 591         struct object *o;
 592         char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
 593         const unsigned hexsz = the_hash_algo->hexsz;
 594
 595         if (do_reachable_revlist(&cmd, src, reachable) < 0)
 596                 return -1;
 597
 598         while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
 599                 struct object_id oid;
 600                 const char *p;
 601
 602                 if (parse_oid_hex(namebuf, &oid, &p) || *p != '\n')
 603                         break;
 604
 605                 o = lookup_object(the_repository, &oid);
 606                 if (o && o->type == OBJ_COMMIT) {
 607                         o->flags &= ~TMP_MARK;
 608                 }
 609         }
 610         for (i = get_max_object_index(); 0 < i; i--) {
 611                 o = get_indexed_object(i - 1);
 612                 if (o && o->type == OBJ_COMMIT &&
 613                     (o->flags & TMP_MARK)) {
 614                         add_object_array(o, NULL, reachable);
 615                                 o->flags &= ~TMP_MARK;
 616                 }
 617         }
 618         close(cmd.out);
 619
 620         if (finish_command(&cmd))
 621                 return -1;
 622
 623         return 0;
 624 }
 625
 626 static int has_unreachable(struct object_array *src)
 627 {
 628         struct child_process cmd = CHILD_PROCESS_INIT;
 629         char buf[1];
 630         int i;
 631
 632         if (do_reachable_revlist(&cmd, src, NULL) < 0)
 633                 return 1;
 634
 635         /*
 636          * The commits out of the rev-list are not ancestors of
 637          * our ref.
 638          */
 639         i = read_in_full(cmd.out, buf, 1);
 640         if (i)
 641                 goto error;
 642         close(cmd.out);
 643         cmd.out = -1;
 644
 645         /*
 646          * rev-list may have died by encountering a bad commit
 647          * in the history, in which case we do want to bail out
 648          * even when it showed no commit.
 649          */
 650         if (finish_command(&cmd))
 651                 goto error;
 652
 653         /* All the non-tip ones are ancestors of what we advertised */
 654         return 0;
 655
 656 error:
 657         sigchain_pop(SIGPIPE);
 658         if (cmd.out >= 0)
 659                 close(cmd.out);
 660         return 1;
 661 }
 662
 663 static void check_non_tip(struct upload_pack_data *data)
 664 {
 665         int i;
 666
 667         /*
 668          * In the normal in-process case without
 669          * uploadpack.allowReachableSHA1InWant,
 670          * non-tip requests can never happen.
 671          */
 672         if (!data->stateless_rpc
 673             && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 674                 goto error;
 675         if (!has_unreachable(&data->want_obj))
 676                 /* All the non-tip ones are ancestors of what we advertised */
 677                 return;
 678
 679 error:
 680         /* Pick one of them (we know there at least is one) */
 681         for (i = 0; i < data->want_obj.nr; i++) {
 682                 struct object *o = data->want_obj.objects[i].item;
 683                 if (!is_our_ref(o)) {
 684                         packet_writer_error(&data->writer,
 685                                             "upload-pack: not our ref %s",
 686                                             oid_to_hex(&o->oid));
 687                         die("git upload-pack: not our ref %s",
 688                             oid_to_hex(&o->oid));
 689                 }
 690         }
 691 }
 692
 693 static void send_shallow(struct packet_writer *writer,
 694                          struct commit_list *result)
 695 {
 696         while (result) {
 697                 struct object *object = &result->item->object;
 698                 if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 699                         packet_writer_write(writer, "shallow %s",
 700                                             oid_to_hex(&object->oid));
 701                         register_shallow(the_repository, &object->oid);
 702                         shallow_nr++;
 703                 }
 704                 result = result->next;
 705         }
 706 }
 707
 708 static void send_unshallow(struct packet_writer *writer,
 709                            const struct object_array *shallows,
 710                            struct object_array *want_obj)
 711 {
 712         int i;
 713
 714         for (i = 0; i < shallows->nr; i++) {
 715                 struct object *object = shallows->objects[i].item;
 716                 if (object->flags & NOT_SHALLOW) {
 717                         struct commit_list *parents;
 718                         packet_writer_write(writer, "unshallow %s",
 719                                             oid_to_hex(&object->oid));
 720                         object->flags &= ~CLIENT_SHALLOW;
 721                         /*
 722                          * We want to _register_ "object" as shallow, but we
 723                          * also need to traverse object's parents to deepen a
 724                          * shallow clone. Unregister it for now so we can
 725                          * parse and add the parents to the want list, then
 726                          * re-register it.
 727                          */
 728                         unregister_shallow(&object->oid);
 729                         object->parsed = 0;
 730                         parse_commit_or_die((struct commit *)object);
 731                         parents = ((struct commit *)object)->parents;
 732                         while (parents) {
 733                                 add_object_array(&parents->item->object,
 734                                                  NULL, want_obj);
 735                                 parents = parents->next;
 736                         }
 737                         add_object_array(object, NULL, &extra_edge_obj);
 738                 }
 739                 /* make sure commit traversal conforms to client */
 740                 register_shallow(the_repository, &object->oid);
 741         }
 742 }
 743
 744 static int check_ref(const char *refname_full, const struct object_id *oid,
 745                      int flag, void *cb_data);
 746 static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
 747                    struct object_array *shallows, struct object_array *want_obj)
 748 {
 749         if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
 750                 int i;
 751
 752                 for (i = 0; i < shallows->nr; i++) {
 753                         struct object *object = shallows->objects[i].item;
 754                         object->flags |= NOT_SHALLOW;
 755                 }
 756         } else if (deepen_relative) {
 757                 struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
 758                 struct commit_list *result;
 759
 760                 /*
 761                  * Checking for reachable shallows requires that our refs be
 762                  * marked with OUR_REF.
 763                  */
 764                 head_ref_namespaced(check_ref, NULL);
 765                 for_each_namespaced_ref(check_ref, NULL);
 766
 767                 get_reachable_list(shallows, &reachable_shallows);
 768                 result = get_shallow_commits(&reachable_shallows,
 769                                              depth + 1,
 770                                              SHALLOW, NOT_SHALLOW);
 771                 send_shallow(writer, result);
 772                 free_commit_list(result);
 773                 object_array_clear(&reachable_shallows);
 774         } else {
 775                 struct commit_list *result;
 776
 777                 result = get_shallow_commits(want_obj, depth,
 778                                              SHALLOW, NOT_SHALLOW);
 779                 send_shallow(writer, result);
 780                 free_commit_list(result);
 781         }
 782
 783         send_unshallow(writer, shallows, want_obj);
 784 }
 785
 786 static void deepen_by_rev_list(struct packet_writer *writer, int ac,
 787                                const char **av,
 788                                struct object_array *shallows,
 789                                struct object_array *want_obj)
 790 {
 791         struct commit_list *result;
 792
 793         disable_commit_graph(the_repository);
 794         result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
 795         send_shallow(writer, result);
 796         free_commit_list(result);
 797         send_unshallow(writer, shallows, want_obj);
 798 }
 799
 800 /* Returns 1 if a shallow list is sent or 0 otherwise */
 801 static int send_shallow_list(struct packet_writer *writer,
 802                              int depth, int deepen_rev_list,
 803                              timestamp_t deepen_since,
 804                              struct string_list *deepen_not,
 805                              int deepen_relative,
 806                              struct object_array *shallows,
 807                              struct object_array *want_obj)
 808 {
 809         int ret = 0;
 810
 811         if (depth > 0 && deepen_rev_list)
 812                 die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
 813         if (depth > 0) {
 814                 deepen(writer, depth, deepen_relative, shallows, want_obj);
 815                 ret = 1;
 816         } else if (deepen_rev_list) {
 817                 struct argv_array av = ARGV_ARRAY_INIT;
 818                 int i;
 819
 820                 argv_array_push(&av, "rev-list");
 821                 if (deepen_since)
 822                         argv_array_pushf(&av, "--max-age=%"PRItime, deepen_since);
 823                 if (deepen_not->nr) {
 824                         argv_array_push(&av, "--not");
 825                         for (i = 0; i < deepen_not->nr; i++) {
 826                                 struct string_list_item *s = deepen_not->items + i;
 827                                 argv_array_push(&av, s->string);
 828                         }
 829                         argv_array_push(&av, "--not");
 830                 }
 831                 for (i = 0; i < want_obj->nr; i++) {
 832                         struct object *o = want_obj->objects[i].item;
 833                         argv_array_push(&av, oid_to_hex(&o->oid));
 834                 }
 835                 deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
 836                 argv_array_clear(&av);
 837                 ret = 1;
 838         } else {
 839                 if (shallows->nr > 0) {
 840                         int i;
 841                         for (i = 0; i < shallows->nr; i++)
 842                                 register_shallow(the_repository,
 843                                                  &shallows->objects[i].item->oid);
 844                 }
 845         }
 846
 847         shallow_nr += shallows->nr;
 848         return ret;
 849 }
 850
 851 static int process_shallow(const char *line, struct object_array *shallows)
 852 {
 853         const char *arg;
 854         if (skip_prefix(line, "shallow ", &arg)) {
 855                 struct object_id oid;
 856                 struct object *object;
 857                 if (get_oid_hex(arg, &oid))
 858                         die("invalid shallow line: %s", line);
 859                 object = parse_object(the_repository, &oid);
 860                 if (!object)
 861                         return 1;
 862                 if (object->type != OBJ_COMMIT)
 863                         die("invalid shallow object %s", oid_to_hex(&oid));
 864                 if (!(object->flags & CLIENT_SHALLOW)) {
 865                         object->flags |= CLIENT_SHALLOW;
 866                         add_object_array(object, NULL, shallows);
 867                 }
 868                 return 1;
 869         }
 870
 871         return 0;
 872 }
 873
 874 static int process_deepen(const char *line, int *depth)
 875 {
 876         const char *arg;
 877         if (skip_prefix(line, "deepen ", &arg)) {
 878                 char *end = NULL;
 879                 *depth = (int)strtol(arg, &end, 0);
 880                 if (!end || *end || *depth <= 0)
 881                         die("Invalid deepen: %s", line);
 882                 return 1;
 883         }
 884
 885         return 0;
 886 }
 887
 888 static int process_deepen_since(const char *line, timestamp_t *deepen_since, int *deepen_rev_list)
 889 {
 890         const char *arg;
 891         if (skip_prefix(line, "deepen-since ", &arg)) {
 892                 char *end = NULL;
 893                 *deepen_since = parse_timestamp(arg, &end, 0);
 894                 if (!end || *end || !deepen_since ||
 895                     /* revisions.c's max_age -1 is special */
 896                     *deepen_since == -1)
 897                         die("Invalid deepen-since: %s", line);
 898                 *deepen_rev_list = 1;
 899                 return 1;
 900         }
 901         return 0;
 902 }
 903
 904 static int process_deepen_not(const char *line, struct string_list *deepen_not, int *deepen_rev_list)
 905 {
 906         const char *arg;
 907         if (skip_prefix(line, "deepen-not ", &arg)) {
 908                 char *ref = NULL;
 909                 struct object_id oid;
 910                 if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
 911                         die("git upload-pack: ambiguous deepen-not: %s", line);
 912                 string_list_append(deepen_not, ref);
 913                 free(ref);
 914                 *deepen_rev_list = 1;
 915                 return 1;
 916         }
 917         return 0;
 918 }
 919
 920 static void receive_needs(struct upload_pack_data *data,
 921                           struct packet_reader *reader)
 922 {
 923         int has_non_tip = 0;
 924
 925         shallow_nr = 0;
 926         for (;;) {
 927                 struct object *o;
 928                 const char *features;
 929                 struct object_id oid_buf;
 930                 const char *arg;
 931
 932                 reset_timeout(data->timeout);
 933                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
 934                         break;
 935
 936                 if (process_shallow(reader->line, &data->shallows))
 937                         continue;
 938                 if (process_deepen(reader->line, &data->depth))
 939                         continue;
 940                 if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
 941                         continue;
 942                 if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
 943                         continue;
 944
 945                 if (skip_prefix(reader->line, "filter ", &arg)) {
 946                         if (!data->filter_capability_requested)
 947                                 die("git upload-pack: filtering capability not negotiated");
 948                         list_objects_filter_die_if_populated(&data->filter_options);
 949                         parse_list_objects_filter(&data->filter_options, arg);
 950                         continue;
 951                 }
 952
 953                 if (!skip_prefix(reader->line, "want ", &arg) ||
 954                     parse_oid_hex(arg, &oid_buf, &features))
 955                         die("git upload-pack: protocol error, "
 956                             "expected to get object ID, not '%s'", reader->line);
 957
 958                 if (parse_feature_request(features, "deepen-relative"))
 959                         data->deepen_relative = 1;
 960                 if (parse_feature_request(features, "multi_ack_detailed"))
 961                         data->multi_ack = 2;
 962                 else if (parse_feature_request(features, "multi_ack"))
 963                         data->multi_ack = 1;
 964                 if (parse_feature_request(features, "no-done"))
 965                         data->no_done = 1;
 966                 if (parse_feature_request(features, "thin-pack"))
 967                         data->use_thin_pack = 1;
 968                 if (parse_feature_request(features, "ofs-delta"))
 969                         data->use_ofs_delta = 1;
 970                 if (parse_feature_request(features, "side-band-64k"))
 971                         data->use_sideband = LARGE_PACKET_MAX;
 972                 else if (parse_feature_request(features, "side-band"))
 973                         data->use_sideband = DEFAULT_PACKET_MAX;
 974                 if (parse_feature_request(features, "no-progress"))
 975                         data->no_progress = 1;
 976                 if (parse_feature_request(features, "include-tag"))
 977                         data->use_include_tag = 1;
 978                 if (allow_filter && parse_feature_request(features, "filter"))
 979                         data->filter_capability_requested = 1;
 980
 981                 o = parse_object(the_repository, &oid_buf);
 982                 if (!o) {
 983                         packet_writer_error(&data->writer,
 984                                             "upload-pack: not our ref %s",
 985                                             oid_to_hex(&oid_buf));
 986                         die("git upload-pack: not our ref %s",
 987                             oid_to_hex(&oid_buf));
 988                 }
 989                 if (!(o->flags & WANTED)) {
 990                         o->flags |= WANTED;
 991                         if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
 992                               || is_our_ref(o)))
 993                                 has_non_tip = 1;
 994                         add_object_array(o, NULL, &data->want_obj);
 995                 }
 996         }
 997
 998         /*
 999          * We have sent all our refs already, and the other end
1000          * should have chosen out of them. When we are operating
1001          * in the stateless RPC mode, however, their choice may
1002          * have been based on the set of older refs advertised
1003          * by another process that handled the initial request.
1004          */
1005         if (has_non_tip)
1006                 check_non_tip(data);
1007
1008         if (!data->use_sideband && data->daemon_mode)
1009                 data->no_progress = 1;
1010
1011         if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
1012                 return;
1013
1014         if (send_shallow_list(&data->writer,
1015                               data->depth,
1016                               data->deepen_rev_list,
1017                               data->deepen_since,
1018                               &data->deepen_not,
1019                               data->deepen_relative,
1020                               &data->shallows,
1021                               &data->want_obj))
1022                 packet_flush(1);
1023 }
1024
1025 /* return non-zero if the ref is hidden, otherwise 0 */
1026 static int mark_our_ref(const char *refname, const char *refname_full,
1027                         const struct object_id *oid)
1028 {
1029         struct object *o = lookup_unknown_object(oid);
1030
1031         if (ref_is_hidden(refname, refname_full)) {
1032                 o->flags |= HIDDEN_REF;
1033                 return 1;
1034         }
1035         o->flags |= OUR_REF;
1036         return 0;
1037 }
1038
1039 static int check_ref(const char *refname_full, const struct object_id *oid,
1040                      int flag, void *cb_data)
1041 {
1042         const char *refname = strip_namespace(refname_full);
1043
1044         mark_our_ref(refname, refname_full, oid);
1045         return 0;
1046 }
1047
1048 static void format_symref_info(struct strbuf *buf, struct string_list *symref)
1049 {
1050         struct string_list_item *item;
1051
1052         if (!symref->nr)
1053                 return;
1054         for_each_string_list_item(item, symref)
1055                 strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
1056 }
1057
1058 static int send_ref(const char *refname, const struct object_id *oid,
1059                     int flag, void *cb_data)
1060 {
1061         static const char *capabilities = "multi_ack thin-pack side-band"
1062                 " side-band-64k ofs-delta shallow deepen-since deepen-not"
1063                 " deepen-relative no-progress include-tag multi_ack_detailed";
1064         const char *refname_nons = strip_namespace(refname);
1065         struct object_id peeled;
1066         struct upload_pack_data *data = cb_data;
1067
1068         if (mark_our_ref(refname_nons, refname, oid))
1069                 return 0;
1070
1071         if (capabilities) {
1072                 struct strbuf symref_info = STRBUF_INIT;
1073
1074                 format_symref_info(&symref_info, &data->symref);
1075                 packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s agent=%s\n",
1076                              oid_to_hex(oid), refname_nons,
1077                              0, capabilities,
1078                              (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
1079                                      " allow-tip-sha1-in-want" : "",
1080                              (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
1081                                      " allow-reachable-sha1-in-want" : "",
1082                              data->stateless_rpc ? " no-done" : "",
1083                              symref_info.buf,
1084                              allow_filter ? " filter" : "",
1085                              git_user_agent_sanitized());
1086                 strbuf_release(&symref_info);
1087         } else {
1088                 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
1089         }
1090         capabilities = NULL;
1091         if (!peel_ref(refname, &peeled))
1092                 packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
1093         return 0;
1094 }
1095
1096 static int find_symref(const char *refname, const struct object_id *oid,
1097                        int flag, void *cb_data)
1098 {
1099         const char *symref_target;
1100         struct string_list_item *item;
1101
1102         if ((flag & REF_ISSYMREF) == 0)
1103                 return 0;
1104         symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
1105         if (!symref_target || (flag & REF_ISSYMREF) == 0)
1106                 die("'%s' is a symref but it is not?", refname);
1107         item = string_list_append(cb_data, strip_namespace(refname));
1108         item->util = xstrdup(strip_namespace(symref_target));
1109         return 0;
1110 }
1111
1112 static int upload_pack_config(const char *var, const char *value, void *unused)
1113 {
1114         if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
1115                 if (git_config_bool(var, value))
1116                         allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
1117                 else
1118                         allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
1119         } else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
1120                 if (git_config_bool(var, value))
1121                         allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
1122                 else
1123                         allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
1124         } else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
1125                 if (git_config_bool(var, value))
1126                         allow_unadvertised_object_request |= ALLOW_ANY_SHA1;
1127                 else
1128                         allow_unadvertised_object_request &= ~ALLOW_ANY_SHA1;
1129         } else if (!strcmp("uploadpack.keepalive", var)) {
1130                 keepalive = git_config_int(var, value);
1131                 if (!keepalive)
1132                         keepalive = -1;
1133         } else if (!strcmp("uploadpack.allowfilter", var)) {
1134                 allow_filter = git_config_bool(var, value);
1135         } else if (!strcmp("uploadpack.allowrefinwant", var)) {
1136                 allow_ref_in_want = git_config_bool(var, value);
1137         } else if (!strcmp("uploadpack.allowsidebandall", var)) {
1138                 allow_sideband_all = git_config_bool(var, value);
1139         } else if (!strcmp("core.precomposeunicode", var)) {
1140                 precomposed_unicode = git_config_bool(var, value);
1141         }
1142
1143         if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
1144         current_config_scope() != CONFIG_SCOPE_WORKTREE) {
1145                 if (!strcmp("uploadpack.packobjectshook", var))
1146                         return git_config_string(&pack_objects_hook, var, value);
1147         }
1148
1149         return parse_hide_refs_config(var, value, "uploadpack");
1150 }
1151
1152 void upload_pack(struct upload_pack_options *options)
1153 {
1154         struct packet_reader reader;
1155         struct upload_pack_data data;
1156
1157         git_config(upload_pack_config, NULL);
1158
1159         upload_pack_data_init(&data);
1160
1161         data.stateless_rpc = options->stateless_rpc;
1162         data.daemon_mode = options->daemon_mode;
1163         data.timeout = options->timeout;
1164
1165         head_ref_namespaced(find_symref, &data.symref);
1166
1167         if (options->advertise_refs || !data.stateless_rpc) {
1168                 reset_timeout(data.timeout);
1169                 head_ref_namespaced(send_ref, &data);
1170                 for_each_namespaced_ref(send_ref, &data);
1171                 advertise_shallow_grafts(1);
1172                 packet_flush(1);
1173         } else {
1174                 head_ref_namespaced(check_ref, NULL);
1175                 for_each_namespaced_ref(check_ref, NULL);
1176         }
1177
1178         if (!options->advertise_refs) {
1179                 packet_reader_init(&reader, 0, NULL, 0,
1180                                    PACKET_READ_CHOMP_NEWLINE |
1181                                    PACKET_READ_DIE_ON_ERR_PACKET);
1182
1183                 receive_needs(&data, &reader);
1184                 if (data.want_obj.nr) {
1185                         get_common_commits(&data, &reader);
1186                         create_pack_file(&data);
1187                 }
1188         }
1189
1190         upload_pack_data_clear(&data);
1191 }
1192
1193 static int parse_want(struct packet_writer *writer, const char *line,
1194                       struct object_array *want_obj)
1195 {
1196         const char *arg;
1197         if (skip_prefix(line, "want ", &arg)) {
1198                 struct object_id oid;
1199                 struct object *o;
1200
1201                 if (get_oid_hex(arg, &oid))
1202                         die("git upload-pack: protocol error, "
1203                             "expected to get oid, not '%s'", line);
1204
1205                 o = parse_object(the_repository, &oid);
1206                 if (!o) {
1207                         packet_writer_error(writer,
1208                                             "upload-pack: not our ref %s",
1209                                             oid_to_hex(&oid));
1210                         die("git upload-pack: not our ref %s",
1211                             oid_to_hex(&oid));
1212                 }
1213
1214                 if (!(o->flags & WANTED)) {
1215                         o->flags |= WANTED;
1216                         add_object_array(o, NULL, want_obj);
1217                 }
1218
1219                 return 1;
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int parse_want_ref(struct packet_writer *writer, const char *line,
1226                           struct string_list *wanted_refs,
1227                           struct object_array *want_obj)
1228 {
1229         const char *arg;
1230         if (skip_prefix(line, "want-ref ", &arg)) {
1231                 struct object_id oid;
1232                 struct string_list_item *item;
1233                 struct object *o;
1234
1235                 if (read_ref(arg, &oid)) {
1236                         packet_writer_error(writer, "unknown ref %s", arg);
1237                         die("unknown ref %s", arg);
1238                 }
1239
1240                 item = string_list_append(wanted_refs, arg);
1241                 item->util = oiddup(&oid);
1242
1243                 o = parse_object_or_die(&oid, arg);
1244                 if (!(o->flags & WANTED)) {
1245                         o->flags |= WANTED;
1246                         add_object_array(o, NULL, want_obj);
1247                 }
1248
1249                 return 1;
1250         }
1251
1252         return 0;
1253 }
1254
1255 static int parse_have(const char *line, struct oid_array *haves)
1256 {
1257         const char *arg;
1258         if (skip_prefix(line, "have ", &arg)) {
1259                 struct object_id oid;
1260
1261                 if (get_oid_hex(arg, &oid))
1262                         die("git upload-pack: expected SHA1 object, got '%s'", arg);
1263                 oid_array_append(haves, &oid);
1264                 return 1;
1265         }
1266
1267         return 0;
1268 }
1269
1270 static void process_args(struct packet_reader *request,
1271                          struct upload_pack_data *data)
1272 {
1273         while (packet_reader_read(request) == PACKET_READ_NORMAL) {
1274                 const char *arg = request->line;
1275                 const char *p;
1276
1277                 /* process want */
1278                 if (parse_want(&data->writer, arg, &data->want_obj))
1279                         continue;
1280                 if (allow_ref_in_want &&
1281                     parse_want_ref(&data->writer, arg, &data->wanted_refs,
1282                                    &data->want_obj))
1283                         continue;
1284                 /* process have line */
1285                 if (parse_have(arg, &data->haves))
1286                         continue;
1287
1288                 /* process args like thin-pack */
1289                 if (!strcmp(arg, "thin-pack")) {
1290                         data->use_thin_pack = 1;
1291                         continue;
1292                 }
1293                 if (!strcmp(arg, "ofs-delta")) {
1294                         data->use_ofs_delta = 1;
1295                         continue;
1296                 }
1297                 if (!strcmp(arg, "no-progress")) {
1298                         data->no_progress = 1;
1299                         continue;
1300                 }
1301                 if (!strcmp(arg, "include-tag")) {
1302                         data->use_include_tag = 1;
1303                         continue;
1304                 }
1305                 if (!strcmp(arg, "done")) {
1306                         data->done = 1;
1307                         continue;
1308                 }
1309
1310                 /* Shallow related arguments */
1311                 if (process_shallow(arg, &data->shallows))
1312                         continue;
1313                 if (process_deepen(arg, &data->depth))
1314                         continue;
1315                 if (process_deepen_since(arg, &data->deepen_since,
1316                                          &data->deepen_rev_list))
1317                         continue;
1318                 if (process_deepen_not(arg, &data->deepen_not,
1319                                        &data->deepen_rev_list))
1320                         continue;
1321                 if (!strcmp(arg, "deepen-relative")) {
1322                         data->deepen_relative = 1;
1323                         continue;
1324                 }
1325
1326                 if (allow_filter && skip_prefix(arg, "filter ", &p)) {
1327                         list_objects_filter_die_if_populated(&data->filter_options);
1328                         parse_list_objects_filter(&data->filter_options, p);
1329                         continue;
1330                 }
1331
1332                 if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1333                      allow_sideband_all) &&
1334                     !strcmp(arg, "sideband-all")) {
1335                         data->writer.use_sideband = 1;
1336                         continue;
1337                 }
1338
1339                 /* ignore unknown lines maybe? */
1340                 die("unexpected line: '%s'", arg);
1341         }
1342
1343         if (request->status != PACKET_READ_FLUSH)
1344                 die(_("expected flush after fetch arguments"));
1345 }
1346
1347 static int process_haves(struct oid_array *haves, struct oid_array *common,
1348                          struct object_array *have_obj)
1349 {
1350         int i;
1351
1352         /* Process haves */
1353         for (i = 0; i < haves->nr; i++) {
1354                 const struct object_id *oid = &haves->oid[i];
1355                 struct object *o;
1356                 int we_knew_they_have = 0;
1357
1358                 if (!has_object_file(oid))
1359                         continue;
1360
1361                 oid_array_append(common, oid);
1362
1363                 o = parse_object(the_repository, oid);
1364                 if (!o)
1365                         die("oops (%s)", oid_to_hex(oid));
1366                 if (o->type == OBJ_COMMIT) {
1367                         struct commit_list *parents;
1368                         struct commit *commit = (struct commit *)o;
1369                         if (o->flags & THEY_HAVE)
1370                                 we_knew_they_have = 1;
1371                         else
1372                                 o->flags |= THEY_HAVE;
1373                         if (!oldest_have || (commit->date < oldest_have))
1374                                 oldest_have = commit->date;
1375                         for (parents = commit->parents;
1376                              parents;
1377                              parents = parents->next)
1378                                 parents->item->object.flags |= THEY_HAVE;
1379                 }
1380                 if (!we_knew_they_have)
1381                         add_object_array(o, NULL, have_obj);
1382         }
1383
1384         return 0;
1385 }
1386
1387 static int send_acks(struct packet_writer *writer, struct oid_array *acks,
1388                      const struct object_array *have_obj,
1389                      struct object_array *want_obj)
1390 {
1391         int i;
1392
1393         packet_writer_write(writer, "acknowledgments\n");
1394
1395         /* Send Acks */
1396         if (!acks->nr)
1397                 packet_writer_write(writer, "NAK\n");
1398
1399         for (i = 0; i < acks->nr; i++) {
1400                 packet_writer_write(writer, "ACK %s\n",
1401                                     oid_to_hex(&acks->oid[i]));
1402         }
1403
1404         if (ok_to_give_up(have_obj, want_obj)) {
1405                 /* Send Ready */
1406                 packet_writer_write(writer, "ready\n");
1407                 return 1;
1408         }
1409
1410         return 0;
1411 }
1412
1413 static int process_haves_and_send_acks(struct upload_pack_data *data)
1414 {
1415         struct oid_array common = OID_ARRAY_INIT;
1416         int ret = 0;
1417
1418         process_haves(&data->haves, &common, &data->have_obj);
1419         if (data->done) {
1420                 ret = 1;
1421         } else if (send_acks(&data->writer, &common,
1422                              &data->have_obj, &data->want_obj)) {
1423                 packet_writer_delim(&data->writer);
1424                 ret = 1;
1425         } else {
1426                 /* Add Flush */
1427                 packet_writer_flush(&data->writer);
1428                 ret = 0;
1429         }
1430
1431         oid_array_clear(&data->haves);
1432         oid_array_clear(&common);
1433         return ret;
1434 }
1435
1436 static void send_wanted_ref_info(struct upload_pack_data *data)
1437 {
1438         const struct string_list_item *item;
1439
1440         if (!data->wanted_refs.nr)
1441                 return;
1442
1443         packet_writer_write(&data->writer, "wanted-refs\n");
1444
1445         for_each_string_list_item(item, &data->wanted_refs) {
1446                 packet_writer_write(&data->writer, "%s %s\n",
1447                                     oid_to_hex(item->util),
1448                                     item->string);
1449         }
1450
1451         packet_writer_delim(&data->writer);
1452 }
1453
1454 static void send_shallow_info(struct upload_pack_data *data)
1455 {
1456         /* No shallow info needs to be sent */
1457         if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
1458             !is_repository_shallow(the_repository))
1459                 return;
1460
1461         packet_writer_write(&data->writer, "shallow-info\n");
1462
1463         if (!send_shallow_list(&data->writer, data->depth,
1464                                data->deepen_rev_list,
1465                                data->deepen_since, &data->deepen_not,
1466                                data->deepen_relative,
1467                                &data->shallows, &data->want_obj) &&
1468             is_repository_shallow(the_repository))
1469                 deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
1470                        &data->shallows, &data->want_obj);
1471
1472         packet_delim(1);
1473 }
1474
1475 enum fetch_state {
1476         FETCH_PROCESS_ARGS = 0,
1477         FETCH_SEND_ACKS,
1478         FETCH_SEND_PACK,
1479         FETCH_DONE,
1480 };
1481
1482 int upload_pack_v2(struct repository *r, struct argv_array *keys,
1483                    struct packet_reader *request)
1484 {
1485         enum fetch_state state = FETCH_PROCESS_ARGS;
1486         struct upload_pack_data data;
1487
1488         clear_object_flags(ALL_FLAGS);
1489
1490         git_config(upload_pack_config, NULL);
1491
1492         upload_pack_data_init(&data);
1493         data.use_sideband = LARGE_PACKET_MAX;
1494
1495         while (state != FETCH_DONE) {
1496                 switch (state) {
1497                 case FETCH_PROCESS_ARGS:
1498                         process_args(request, &data);
1499
1500                         if (!data.want_obj.nr) {
1501                                 /*
1502                                  * Request didn't contain any 'want' lines,
1503                                  * guess they didn't want anything.
1504                                  */
1505                                 state = FETCH_DONE;
1506                         } else if (data.haves.nr) {
1507                                 /*
1508                                  * Request had 'have' lines, so lets ACK them.
1509                                  */
1510                                 state = FETCH_SEND_ACKS;
1511                         } else {
1512                                 /*
1513                                  * Request had 'want's but no 'have's so we can
1514                                  * immedietly go to construct and send a pack.
1515                                  */
1516                                 state = FETCH_SEND_PACK;
1517                         }
1518                         break;
1519                 case FETCH_SEND_ACKS:
1520                         if (process_haves_and_send_acks(&data))
1521                                 state = FETCH_SEND_PACK;
1522                         else
1523                                 state = FETCH_DONE;
1524                         break;
1525                 case FETCH_SEND_PACK:
1526                         send_wanted_ref_info(&data);
1527                         send_shallow_info(&data);
1528
1529                         packet_writer_write(&data.writer, "packfile\n");
1530                         create_pack_file(&data);
1531                         state = FETCH_DONE;
1532                         break;
1533                 case FETCH_DONE:
1534                         continue;
1535                 }
1536         }
1537
1538         upload_pack_data_clear(&data);
1539         return 0;
1540 }
1541
1542 int upload_pack_advertise(struct repository *r,
1543                           struct strbuf *value)
1544 {
1545         if (value) {
1546                 int allow_filter_value;
1547                 int allow_ref_in_want;
1548                 int allow_sideband_all_value;
1549
1550                 strbuf_addstr(value, "shallow");
1551
1552                 if (!repo_config_get_bool(the_repository,
1553                                          "uploadpack.allowfilter",
1554                                          &allow_filter_value) &&
1555                     allow_filter_value)
1556                         strbuf_addstr(value, " filter");
1557
1558                 if (!repo_config_get_bool(the_repository,
1559                                          "uploadpack.allowrefinwant",
1560                                          &allow_ref_in_want) &&
1561                     allow_ref_in_want)
1562                         strbuf_addstr(value, " ref-in-want");
1563
1564                 if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
1565                     (!repo_config_get_bool(the_repository,
1566                                            "uploadpack.allowsidebandall",
1567                                            &allow_sideband_all_value) &&
1568                      allow_sideband_all_value))
1569                         strbuf_addstr(value, " sideband-all");
1570         }
1571
1572         return 1;
1573 }